/Engine/Plugins/Online/OnlineSubsystemUtils/Source/OnlineSubsystemUtils/Public/SpectatorBeaconState.h
the stringified version of the enum passed in
namespace ESpectatorReservationResult { const TCHAR * ESpectatorReservationResult::ToString ( [ESpectatorReservationResult::Type](API\Plugins\OnlineSubsystemUtils\ESpectatorReservationResult__Typ-) SessionType ) }